Trim the excess fat from the meat and season it well with salt and pepper. Saute the bacon in a large heavy range-top safe casserole or dutch oven until crisp, stirring occasionally. Remove the bacon with a slotted spoon. EIther discard the fat and add a tablespoon of cooking oil to the pan or continue using the bacon fat and brown the lamb on all sides, turning with two wooden spoons. Remove the meat and brown the onion, carrots, celery and garlic. Return the lamb and bacon to the pan. Add wine and boil down 2-3 minutes. Add the parsley and tomatoes. Stir well. Cover and braise in a preheated 375 degree oven for about 2 1/2 hours, basting 2-3 times. Add water about halfway through if the pan dries out, scraping down the sides of the pan so the developing color goes into the sauce. When tender, remove the meat from the pan and let it stand 5 minutes in a warm place before slicing in thick slices. Meanwhile, tip the pan and remove the surface fat with a metal spoon. The sauce should be a good consistency, but if thin, strain and press the vegetable pulp through the sieve to help thicken the sauce. Serve the sliced lamb with a little sauce spooned over it and sprinkled with minced parsley. Serve the remaining sauce in a separate bowl.